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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ed311b434ea675e6e0a4b4d2a8d8844ccb2c9530d059133ea16a108a863c9c' 
  AND token = 'BwDd0kjFnAMG3RYVXZkTEa74W9j+mkuiIuvk6JcHq6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}