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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f5f36a7b0d26f0ebf63d5ea5a3216444b484ca108173d4a9c771a136ce294d' 
  AND token = '7dVcW6Kin9kYNG4wjzDHlRzTFED7FRz9YpQMNQWvo70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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