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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37466814386af710d971ccbfadbd80491a5df7816e2d4128330cb812abfb01d' 
  AND token = '7S7EEs1+grX932zxoQ3OIz9qywwImaV263yvjMNoqvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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