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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0e6a87b5db279d154be1539729a83056a39d023b94d5031a4ad10a880f212a' 
  AND token = 'MpwG0vJVKrxdPOnQJmBMj6znIK7Xxgv8IuvEWK1M5R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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