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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923d6b3b12b2c0aab50aef53bf173800cd618c3ecec733af14a2cfce09a78ce6' 
  AND token = 'V+KtQCA3JW7SDdTQZG48zYBhxkUr7TRSCzW5nGOp6ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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