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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2287694e3c9100958622d69a0893b14d5b6d1411d4d394159944bb0f3cdc5e4' 
  AND token = 'b9j3u87ITI3snBtTlevqNacVUF5rj6edZ985x9/2Luk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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