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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d01cfeb25cb32af884c1f692463aa2f87620d06fc4809644fbb2589a568a6b9' 
  AND token = '2Q/DjAWqBXE+0apPsH2WbzX7Xghqfj8xKfvU7PEA1qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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