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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d67d2ef1780962f20fc2ba77a3a8f7addd9058da362b8c90decd24326bec9e' 
  AND token = 'aYdVk5GaeJv1BAc+HZJ+BN6KIdkkenUMXcTr9Gv3n88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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