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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b98cd0ab265ebea9dffa70d7f7d9f29b2b2c00f33252b0a19182b86f0d9efc' 
  AND token = 'pIKFWpx2hdid7cYrKA45aWA495SvgClmRmz3J2BrLoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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