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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b96c330925fd436c61505072881f70b17b703917914322c5cf0f7e01eab0d5' 
  AND token = '7m8LZE9KS+y7+qXYG8DAZ601TWoCAofytVou94Re8Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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