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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95cc86c1b3a28c42ae1973cd43b16cdc01262e23ded89dca3941519c8558a02' 
  AND token = 'kILqerJP30egGW5rVmOujQeZfelGvQJ3MRlGh+RAbJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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