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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f14976ff801d4783c2206aab7f8aa0c0fd9dd8a0f9e504d8eb7cf585278e95' 
  AND token = '4MYm92bIRtzvMzWNFexaZ3KtBnlb/mh0tanfyNUHkB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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