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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7446e59d2fd7c447b7b6604069491f5d99bb3059202ca69c8d8028ef9201eb3b' 
  AND token = 'zhSc6sPVeZ0gMKQ1y8la+yuA5uVVBrnN0lCxEHUYPpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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