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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c15a4e9bb72515335b4f8f9f063e1c3ba5e121aa26d2743eb7b8ad761e9e73b' 
  AND token = 'qrQz68hkb4k9M3oq8A89fGUJ8A9N4d0o0dTulEw70jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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