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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18eb53f8f08fd7c23f60ca07e3d9de0d9bf3d31097995ef5b41361322caf1354' 
  AND token = 'E85eonLb6vpcki3QycjQ/d67FwLLP3+sZyhGRQLZpc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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