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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a8d22ab2ed02cb500d6430ed5a04976773862ecd4e741e65b1bcac683f5de6' 
  AND token = 'ojcNX0S474oHI6GHWBiaRYO+biReNN4pLLZAVndWZNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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