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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3bbf6d9dd39f92641ec625d15a618aac595853cdb32e7d3c814eed586a313c' 
  AND token = '6tW0fVcBpb8pdcshYcbBZbEtXzJIC1AkvqHvts0kCPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00381

JSON explain

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