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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5e5c8690dcf8ca7d441d2f1a1ffb0c7ff7bbc357a2df7c578a4ccbc7fd3c0a' 
  AND token = '8YZqMCqTnESHBK8nh4bkZG0om+KuDPdYjspf58IbX1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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