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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b230442d213adde4aa8f618a34e6811ca60e423dec2f1bb14748d5223d293ce' 
  AND token = 'OleobOPiMnn8uIer5p+GrTCrWXVJacG1fGQruJa2NlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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