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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91720b2a3826b0eff5f50c1d764929e308db51e8c4c3515717734e2bdfe5555c' 
  AND token = '2yS5UyVYYfec4xDnpDWzELHa/fsrWvf6tB9MCHx0/pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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