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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fa85dc1ffe4932baa8d0c5c804a1649a295adf95644fa5dc6eb56bd3c1ca1c' 
  AND token = 'WgAicwyVbUXbMtg+bkjW8tE359FKj6/zXECZBis2LLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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