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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93a711d7f06e70e97bba9c503bca562d4428737827132d6d9ec8d5ca222154a' 
  AND token = 'K2HT5Z/O+S2Qm9eHCTGQJEeldGEk/dnz68Ew8xCoWwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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