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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a177c1ead9f1b8b1e2415b55796abf4640ad7018d46f82e34dc11e45f183d887' 
  AND token = 'k/GrutAVs0rt5kPLKqh3hbyf1JktjgMrp1Lbj1++Wao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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