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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9c10f35bc17e0989cfc30d244abf389e918513fc9cdbf7c6151d8b5bc61fac' 
  AND token = 'dgYtP/bfToXkRr2USxXb+ohcxfXYl2QJlLhB178jweE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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