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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28a100247e5465112ce8e8f6940a890293ab6d2108ee85dd75a0b3a33587fe0' 
  AND token = '/nWSm4O2neiqpM0FvhAiahXI8z5PvzatRR6PCknpmn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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