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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46544fb8678a9ce1c29ac6e63f4b54dd8a42fb04e6c2dad58dc01ad25b20871f' 
  AND token = 'wGLDn4xJ0H0qkSxbwLELTCtN0hB+alhqWaXFsthIPso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.04698

JSON explain

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