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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95250796d969309dfe836e518700cd0c773361b8accf1c7368114707bc26548b' 
  AND token = 'WAEUbtAVzD4NWmRslOh5PG8XnHxV19m9hpe4WDPg1w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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