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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e839ab04cb1093227f0a01fda0100e701b8809d6786d87537f71b8e67414eb07' 
  AND token = 'll6BNcxjvqmfC0CGll9hZfoxilVDBjQru098j1ISQlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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