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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74c1586f272649c0d94fbfed2075248a6792b03467ea0cdb8174f86017a240f' 
  AND token = '1PEnXKZFbbnNrwNgFZLMpG6SwNSWP2NF0CgpcRBUtK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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