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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e18093968e4e6e849d35f90424ddb77283b2587f6a6a6428acce4187bda7a06' 
  AND token = 'm4NA13o7J5QRMVKH5baADdmJfendqJpAny03atM55aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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