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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39da78920a2d5e72bcf06a2547db68c655ba4c58458a9bfc5b56e5e04077f4b' 
  AND token = 'tm22xPuCd+6Uf303AAteQbNS0z20IjtQi+3losfOFVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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