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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27e43758c85aa08a69c51508b251543007c6d6a9c54c77bb5ab7f47d9e482b6' 
  AND token = 'cMyGT8BY5+DIxagbI2mOaUDEZDpqLxzG8dnelAyJkuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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