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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13547d8a1df1ec0556af527276ed8efbcc5e890ba5cf3c46e0f9087d8bdf853' 
  AND token = 'wLjUlXvSzonyXuNPYHx09ZxaejU+GtPUE9EZzl2Xaes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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