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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8870c3eb330faabf19d6b9cbcf9e8337fa02bf387b51aaf6c4a1cb58c697fe70' 
  AND token = 'GNAh88tUsj+otETG10L/FU5Qw9Kgih8XMcngmfJdrT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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