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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753b79cd1cd8042d8fbb4e370a0d7c28f41a17057838db1f853c28daa32a3685' 
  AND token = 'CeJ1RdWZ8mNP5G0dGlldI0Rsliab98vivH5i5YqThWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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