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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c3b13f2c3a50dcfeca15b9e8c4cd95c55f3ac9354d38b0e210fee17c1666f5' 
  AND token = 'HXGFBoo90+T0C3kSTb7FXx1K83OwB8GHZWleuTmr3h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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