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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05e66ba18795fd4a91df38b8024d0c09afc244764204fa46015fe5016affc27' 
  AND token = '/dOwQqx5lnssmY4o0btJwi51CNHGb3gG4p/pq6Hqg0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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