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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d669e04f0e7cb376b21fdecadeeb687cdb12859ecbd3d9e5e4c46b00085356' 
  AND token = 'MMATs7V8XGkCawqd2h1hSTxu/MdOHv42lX8psqopS2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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