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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c6e0bc04f9e6df33b8fd693f2c04534f46da5d9a5d6ae56fed9c9ccf5dc2dc' 
  AND token = 'WiE13zfk3ynDPZxj0TT4V6fS9JZaZFBmPBfSCNf41QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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