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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2625d6eafcc8c98eafe2f7ba04821ae186b89ce591486d8ad70f22d4e601c362' 
  AND token = '7ieWChnGQW+fLmyhLsQzF9Vrsr6M2JmAL6lhpwznRRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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