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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19a2c2ec7f6dd2d55a75a6477c8f660f2a6331081ddad6ca113e2439a897771' 
  AND token = 'iftv5A3M8ZmAYx+x9/Es5Pu4BHkPU0mp+dYkNUyegkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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