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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea88a5a33b4640d33e908eaa37d71bc61c180b8de85fa871f42f0ac507bf0e4' 
  AND token = 'XNxMK+m/cXhNSKiJrQ8Cz46KL3LJbMMxcpTmL+GjyZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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