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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336326b3f769e7d4525543e4f2eeeed695344fefd61d7d5df6ec8456a4729994' 
  AND token = 'EKg1EDaQM82W27d5XdrfcDR+GjfHyogNcBccCKT3OJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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