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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eae608b5b1b9e67ea61a8c2fc59d2b68d9c5a75e3581f1af67f50fc30a43d48' 
  AND token = '7tLwyie+eydPnXtt63rH1krthAkNuMfMXlgXPFD8Aac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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