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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c02250d5c76105a8e873647d511ee8b2d69a42f8fb6fa48e92c111a4cbf90f' 
  AND token = 'A5BvspHJJsyrEiAxv/tFAi6AUJUW/rOXiNxjvzBGu8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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