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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b4214d9c555695b66f80972faeca2e5e03cb9c493ba5d296acef7d6a52bdf2' 
  AND token = '/7fynadSBcOA9Awhxq4t0VpEABpF6jfS3FhpUegenYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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