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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c7c618823b06c2892efb8315c99aea5728a91816af7b5739abb7b80a8c8cc2' 
  AND token = '4EtFaFtNgyPANd0oNM2elhlSITvJglGbY3vz5LXGRGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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