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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2568b6e3b3157bfa142d7409c61b357bb1da39f5617fbaa580fa9396df7282a2' 
  AND token = 'm/eQSkJQyNO0ZIm5v6F4i2SH2qYw1kBuu6ZYUtfZm7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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