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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc799c670e91dfcdffda44e99f496e1661c1b5d1fafef90b5f0d3940c5cd89d' 
  AND token = 'ccGfRyX87ES+8v5VXtsCf/uKZz8OSGU6XCJJHTuZYB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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