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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46e5bd06cd4a6d9d3519066d8c525630b467f85728cdfe36fb72620b87994d7' 
  AND token = 'Tahyjf7BfMmVCEODu/RndrwxSpZ9Q0N1jMnl8GCVsrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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