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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b7f76665b2525b87c8c7c5f8f3f14eab5ec4e8b92cbac7befea22502308384' 
  AND token = 'fs2HbcCbVSEGm3PXD3VQJ+lymMHtRraP7Xy9cNS4qp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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