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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff1f206ff64ef3db23bbab4e7b6403002c5e3ef68a7b95e51b565726fbb7b2c' 
  AND token = 'jBGrWYEU+ztDUrS9xAthpBqFmyyD2hjrftelCo7CmhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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