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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d53530a5051434eea4248d62cf75b30303f32328423d00f83bb3db1ad006953' 
  AND token = 'lZqkF7+fBgBaJm8dQ0JyVO3Gf+IPZ8NWH+zAMPbPDRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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