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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2607b459fdb5def0e2e6ef2eee4e63a32f58fed009ea68112ce6bdd13fa7217a' 
  AND token = '9nfvuZHwnjzr9PwV5MdFR+NirlsccIc9/P15BfgNcX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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