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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2356d59e18a70a11d8319dbc95fb4f4e32c8c4ff9158d5e108e77e1eb064ef' 
  AND token = 'U89E+yjK2nqVe805VQ5pcC4+QSVXjbQO8n/YhJ843Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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