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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345ae3da74f9040054d8c2476ab3e7ac836653902a340efab9e0e971460bdc6a' 
  AND token = '5Uh9OOerZ1qBq44WDBmXAbR0P3sMsZRN2HowhGnaZZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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