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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65038d01d0388fd3327d4284530f42751878ab508b8b4e037308bd7fb07f03a' 
  AND token = 'QfniPvo5g/Y0O7vyMeJTvPAf3zAPEnRxWur+2fcp/UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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