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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1931ea8751fabf0915d6fa336e6d861fa088935423e2962ce2c13d2e7bad3d43' 
  AND token = '91iiI2zcQ4thalyd3V6t1e4c4kSfXos8NGjzr+C2gfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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