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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4a773d441b045abac67e0dca3e790a07c04a6ed72e4d993bf9337020ebbb1f' 
  AND token = '6FHrxn40GqhNxVS1+1GgMjo+54C4x+ZpbS6wGeUFhiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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