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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec137b39ed535b87fd05bc74e221aafafabe5eb91e84a01fd111c61a933a3fc' 
  AND token = 'E6JyOyGFASJ1d6pl0+PtszvmgNtC4et39O0W4Mi48AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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