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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2f885cff97b5922fdc52d527c72d56df6ced155b4d550c1b961978bc2969c5' 
  AND token = 'PJMYBWrYYWy9AeB2HocBlfypp1jLA6jU3O5EuzzwB58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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