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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5579b7372ffd88f3be81a9e7d888c17a5231d77e3767d7e620872d5af1fbd252' 
  AND token = 'fgEFmCee1GI96hvftSKbTk0jg/DwgU9AjoZVAzFAYi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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