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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85784b37f0c4bc56aed9510c60ccafaa515c04ac4ff49635df8fa1450e50f668' 
  AND token = '6M7wJLzOhKdVnU6ZcaXkS1i1gH5j8OBqex9V3f4hDNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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