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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d74490336b743f9cf70833cbe798c878214455cd8c62360d18ece835b033aeb' 
  AND token = 'Rmfa4j9s54XHCBm6boA2eDwF7hOj7hg3XPZVSrDqAN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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